模拟酸雨对碱性农田土壤酸缓冲容量的影响  

Effects of Simulated Acid Rain on Acid Buffering Capacity of Alkaline Farmland Soil

作　　者：蔡彦明[1] 张浩[2] 师荣光[1,2] 沃飞[1] 彭胜巍[2] 

机构地区：[1]农业部环境保护科研监测所,天津300191 [2]南开大学环境科学与工程学院/环境污染过程与基准教育部重点实验室,天津300071

出　　处：《水土保持学报》2009年第4期157-160,共4页Journal of Soil and Water Conservation

基　　金：中央级公益性科研院所(农业部环境保护科研监测所)基本科研业务费专项基金;农业部"948"项目(2008Z10)

摘　　要：采用模拟降雨设备,用改进的酸碱滴定曲线法研究了pH值分别为3.0,3.5,4.0,4.5和5.0的酸雨在降雨量达到120 mm,240 mm,360 mm和480 mm时土壤酸缓冲容量的变化情况。结果表明,酸碱滴定曲线法适用于天津碱性农田土壤,使北方碱性土壤酸缓冲容量降低的酸雨pH临界值可能在3.5左右。降雨量对土壤酸缓冲容量有明显影响,酸缓冲容量变化率K在120 mm处理时有最大值,并随降雨量增加有降低趋势。The alkaline farmland soil sampled in Tianjin was used and acid buffering capacity of soil processed by pH 3.0, 3.5, 4.0, 4.5 and 5.0 acid rain were determined when the rainfall were 120 mm, 240 mm, 360 mm and 480 mm in this experiments. Results showed that the method of titration curve of acid and alkali was suitable for alkaline farmland soil. The critical pH that could reduce the acid buffering capacity of alkaline farmland soil was about 3.5. Rainfall had great effect on acid buffering capacity and the change rate K was the highest when rainfall was 120 mm, and K would decrease when the rainfall increased gradually.

关 键 词：模拟降雨 碱性土壤 酸缓冲容量 酸碱滴定 

分 类 号：X131.3[环境科学与工程—环境科学]